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span.3CharChar5
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span.2Char
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span.13Char
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span.3Char0
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span.4Char
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</head>

<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>

<div class=WordSection1 style='layout-grid:15.6pt'>

<p class=ab style='margin-left:20.0pt;text-indent:-20.0pt'><span
style='font-family:黑体'>程序</span><span lang=EN-US>11-4 linux/kernel/math/convert.c</span></p>

<div class=a align=center style='text-align:center'><span lang=EN-US>

<hr size=4 width="100%" align=center>

</span></div>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>2</span></u> <b><i>&nbsp;*
linux/kernel/math/convert.c</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>3</span></u> <b><i>&nbsp;*</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>4</span></u> <b><i>&nbsp;*
(C) 1991 Linus Torvalds</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>5</span></u> <b><i>&nbsp;*/</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>6</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>7</span></u>
#include &lt;linux/math_emu.h&gt; // </span>协处理器头文件。定义临时实数结构和<span lang=EN-US>387</span>寄存器操作宏等。</p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>8</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>9</span></u> <b><i>/*</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>10</span></u> <b><i>&nbsp;*
NOTE!!! There is some &quot;non-obvious&quot; optimisations in the temp_to_long</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</span></u> <b><i>&nbsp;*
and temp_to_short conversion routines: don't touch them if you don't</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>12</span></u> <b><i>&nbsp;*
know what's going on. They are the adding of one in the rounding: the</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>13</span></u> <b><i>&nbsp;*
overflow bit is also used for adding one into the exponent. Thus it</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>14</span></u> <b><i>&nbsp;*
looks like the overflow would be incorrectly handled, but due to the</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u> <b><i>&nbsp;*
way the IEEE numbers work, things are correct.</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u> <b><i>&nbsp;*</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u> <b><i>&nbsp;*
There is no checking for total overflow in the conversions, though (ie</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u> <b><i>&nbsp;*
if the temp-real number simply won't fit in a short- or long-real.)</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>19</span></u> <b><i>&nbsp;*/</i></b></span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /*</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>注意<span
lang=EN-US>!!! </span>在<span lang=EN-US>temp_to_long</span>和<span lang=EN-US>temp_to_short</span>数据类型转换子程序中有些“不明显”</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>的优化处理：如果不理解就不要随意修改。它们是舍入操作中的加<span
lang=EN-US>1</span>：溢出位也同</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>样被用于向指数中加<span
lang=EN-US>1</span>。因此看上去溢出好像没有被正确地处理，但是由于<span lang=EN-US>IEEE</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>浮点数标准所规定数据格式的操作方式，这些做法是正确的。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; *</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>不过这里没有对转换过程中总体溢出作检测（也即临时实数是否能够简单地放入短</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>实数或长实数格式中）。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>20</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>短实数转换成临时实数格式。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>短实数长度是<span
lang=EN-US>32</span>位，其有效数（尾数）长度是<span lang=EN-US>23</span>位，指数是<span
lang=EN-US>8</span>位，还有<span lang=EN-US>1</span>个符号位。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u>
void <u><span style='color:blue'>short_to_temp</span></u>(const <u><span
style='color:blue'>short_real</span></u> * a, <u><span style='color:blue'>temp_real</span></u>
* b)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u> {</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>首先处理被转换的短实数是<span
lang=EN-US>0</span>的情况。若为<span lang=EN-US>0</span>，则设置对应临时实数<span lang=EN-US>b</span>的有效数为<span
lang=EN-US>0</span>。然后根</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>据短实数符号位设置临时实数的符号位，即<span
lang=EN-US>exponent</span>的最高有效位。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(*a &amp; 0x7fffffff)) {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>24</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a = b-&gt;b = 0;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>置临时实数的有效数<span lang=EN-US> = 0</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>25</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (*a)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>26</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = 0x8000;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>设置符号位。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
else</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>28</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = 0;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>29</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>30</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>对于一般短实数，先确定对应临时实数的指数值。这里需要用到整型数偏置表示方法的概念。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>短实数指数的偏置量是<span
lang=EN-US>127</span>，而临时实数指数的偏置量是<span lang=EN-US>16383</span>。因此在取出短实数中指数值</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>后需要变更其中的偏置量为<span
lang=EN-US> 16383</span>。 此时就形成了临时实数格式的指数值 <span lang=EN-US>exponent</span>。另外，</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>如果短实数是负数，则需要设置临时实数的符号位（位<span
lang=EN-US>79</span>）。下一步设置尾数值。方法是把</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>短实数左移<span lang=EN-US>8</span>位，让<span
lang=EN-US>23</span>位尾数最高有效位处于临时实数的位<span lang=EN-US>62</span>处。而临时实数尾数的位<span
lang=EN-US>63</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>处需要恒置一个<span
lang=EN-US>1</span>，即需要或上<span lang=EN-US>0x80000000</span>。最后清掉临时实数低<span
lang=EN-US>32</span>位有效数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>31</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = ((*a&gt;&gt;23) &amp; 0xff)-127+16383;&nbsp; &nbsp;// </span>取出短实数指数位，更换偏置量。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>32</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (*a&lt;0)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>33</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent |= 0x8000;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//
</span>若为负数则设置符号位。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>34</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;b = (*a&lt;&lt;8) | 0x80000000;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;// </span>放置尾数，添加固定<span lang=EN-US>1</span>值。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>35</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a = 0;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>36</span></u> }</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>37</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>长实数转换成临时实数格式。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>方法与<span lang=EN-US>short_to_temp()</span>完全一样。不过长实数指数偏置量是<span
lang=EN-US>1023</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>38</span></u>
void <u><span style='color:blue'>long_to_temp</span></u>(const <u><span
style='color:blue'>long_real</span></u> * a, <u><span style='color:blue'>temp_real</span></u>
* b)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>39</span></u> {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>40</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!a-&gt;a &amp;&amp; !(a-&gt;b &amp; 0x7fffffff)) {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>41</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a = b-&gt;b = 0;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>置临时实数的有效数<span lang=EN-US> = 0</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>42</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (a-&gt;b)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>43</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = 0x8000;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>设置符号位。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>44</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
else</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>45</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = 0;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>46</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>47</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>48</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = ((a-&gt;b &gt;&gt; 20) &amp; 0x7ff)-1023+16383; &nbsp;// </span>取长实数指数，更换偏置量。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>49</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (a-&gt;b&lt;0)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>50</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b-&gt;exponent |= 0x8000;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;//
</span>若为负数则设置符号位。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>51</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;b = 0x80000000 | (a-&gt;b&lt;&lt;11) | (((unsigned
long)a-&gt;a)&gt;&gt;21); // </span>放置尾数，添<span lang=EN-US>1</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>52</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a = a-&gt;a&lt;&lt;11;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>53</span></u> }</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>54</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>临时实数转换成短实数格式。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>过程与<span lang=EN-US>short_to_temp()</span>相反，但需要处理精度和舍入问题。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>55</span></u>
void <u><span style='color:blue'>temp_to_short</span></u>(const <u><span
style='color:blue'>temp_real</span></u> * a, <u><span style='color:blue'>short_real</span></u>
* b)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u> {</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>如果指数部分为<span
lang=EN-US>0</span>，则根据有无符号位设置短实数为<span lang=EN-US>-0 </span>或<span lang=EN-US>0</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>57</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(a-&gt;exponent &amp; 0x7fff)) {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>58</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*b = (a-&gt;exponent)?0x80000000:0;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>59</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>60</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>先处理指数部分。即更换临时实数指数偏置量（<span
lang=EN-US>16383</span>）为短实数的偏置量<span lang=EN-US>127</span>。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>61</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*b = ((((long) a-&gt;exponent)-16383+127) &lt;&lt; 23) &amp; 0x7f800000;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>62</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (a-&gt;exponent &lt; 0)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>若是负数则设置符号位。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>63</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*b |= 0x80000000;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>64</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*b |= (a-&gt;b &gt;&gt; 8) &amp; 0x007fffff;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>取临时实数有效数高<span lang=EN-US>23</span>位。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>根据控制字中的舍入设置执行舍入操作。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>65</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
switch (<u><span style='color:blue'>ROUNDING</span></u>) {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>66</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_NEAREST</span></u>:</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>67</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((a-&gt;b &amp; 0xff) &gt; 0x80)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>68</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
++*b;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>69</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>70</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_DOWN</span></u>:</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>71</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((a-&gt;exponent &amp; 0x8000) &amp;&amp; (a-&gt;b &amp; 0xff))</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>72</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
++*b;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>73</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>74</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_UP</span></u>:</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>75</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (!(a-&gt;exponent &amp; 0x8000)
&amp;&amp; (a-&gt;b &amp; 0xff))</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>76</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
++*b;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>77</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>78</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>79</span></u> }</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>80</span></u> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>临时实数转换成长实数。</p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>81</span></u>
void <u><span style='color:blue'>temp_to_long</span></u>(const <u><span
style='color:blue'>temp_real</span></u> * a, <u><span style='color:blue'>long_real</span></u>
* b)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>82</span></u> {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>83</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(a-&gt;exponent &amp; 0x7fff)) {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>84</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a = 0;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>85</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;b = (a-&gt;exponent)?0x80000000:0;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>86</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>87</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
}</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>88</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;b = (((0x7fff &amp; (long) a-&gt;exponent)-16383+1023) &lt;&lt; 20) &amp;
0x7ff00000;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>89</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (a-&gt;exponent &lt; 0)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>90</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;b |= 0x80000000;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>91</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;b |= (a-&gt;b &gt;&gt; 11) &amp; 0x000fffff;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>92</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a = a-&gt;b &lt;&lt; 21;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>93</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a |= (a-&gt;a &gt;&gt; 11) &amp; 0x001fffff;</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>94</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
switch (<u><span style='color:blue'>ROUNDING</span></u>) {</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>95</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_NEAREST</span></u>:</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>96</span></u>&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if
((a-&gt;a &amp; 0x7ff) &gt; 0x400)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>97</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
__asm__(<i>&quot;addl $1,%0 ; adcl $0,%1&quot;</i></span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>98</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>99</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;&quot;</i> (b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_DOWN</span></u>:</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if ((a-&gt;exponent &amp; 0x8000) &amp;&amp; (a-&gt;b &amp; 0xff))</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
__asm__(<i>&quot;addl $1,%0 ; adcl $0,%1&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i>
(b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;&quot;</i> (b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_UP</span></u>:</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!(a-&gt;exponent &amp; 0x8000) &amp;&amp; (a-&gt;b &amp; 0xff))</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
__asm__(<i>&quot;addl $1,%0 ; adcl $0,%1&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;&quot;</i> (b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
lang=EN-US> }</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>临时实数转换成临时整数格式。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>临时整数也用<span
lang=EN-US>10</span>字节表示。其中低<span lang=EN-US>8</span>字节是无符号整数值，高<span
lang=EN-US>2</span>字节表示指数值和符号位。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>如果高<span lang=EN-US>2</span>字节最高有效位为<span
lang=EN-US>1</span>，则表示是负数；若位<span lang=EN-US>0</span>，表示是正数。</p>

<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
lang=EN-US> void <u><span style='color:blue'>real_to_int</span></u>(const <u><span
style='color:blue'>temp_real</span></u> * a, <u><span style='color:blue'>temp_int</span></u>
* b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
lang=EN-US> {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int <u><span
style='color:blue'>shift</span></u> =&nbsp; 16383 + 63 - (a-&gt;exponent &amp;
0x7fff);</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unsigned long
underflow;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
lang=EN-US> </span></p>

<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b-&gt;a = b-&gt;b =
underflow = 0;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b-&gt;sign =
(a-&gt;exponent &lt; 0);</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (<u><span
style='color:blue'>shift</span></u> &lt; 0) {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>set_OE</span></u>();</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (<u><span
style='color:blue'>shift</span></u> &lt; 32) {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;b = a-&gt;b; b-&gt;a = a-&gt;a;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else if (<u><span
style='color:blue'>shift</span></u> &lt; 64) {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;a = a-&gt;b; underflow = a-&gt;a;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>shift</span></u> -= 32;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else if (<u><span
style='color:blue'>shift</span></u> &lt; 96) {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
underflow = a-&gt;b;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;<u><span style='color:blue'>shift</span></u> -= 64;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; __asm__(<i>&quot;shrdl
%2,%1,%0&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (underflow),<i>&quot;=r&quot;</i> (b-&gt;a)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;c&quot;</i> ((char) <u><span style='color:blue'>shift</span></u>),<i>&quot;&quot;</i>
(underflow),<i>&quot;1&quot;</i> (b-&gt;a));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; __asm__(<i>&quot;shrdl
%2,%1,%0&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;c&quot;</i> ((char) <u><span style='color:blue'>shift</span></u>),<i>&quot;&quot;</i>
(b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; __asm__(<i>&quot;shrl
%1,%0&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;c&quot;</i> ((char) <u><span style='color:blue'>shift</span></u>),<i>&quot;&quot;</i>
(b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; switch (<u><span
style='color:blue'>ROUNDING</span></u>) {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_NEAREST</span></u>:</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
__asm__(<i>&quot;addl %4,%5 ; adcl $0,%0 ; adcl $0,%1&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;&quot;</i> (b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
,<i>&quot;r&quot;</i> (0x7fffffff + (b-&gt;a &amp; 1))</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
,<i>&quot;m&quot;</i> (*&amp;underflow));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_UP</span></u>:</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (!b-&gt;sign &amp;&amp; underflow)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;__asm__(<i>&quot;addl
$1,%0 ; adcl $0,%1&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;&quot;</i> (b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
case <u><span style='color:blue'>ROUND_DOWN</span></u>:</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
if (b-&gt;sign &amp;&amp; underflow)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
__asm__(<i>&quot;addl $1,%0 ; adcl $0,%1&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;&quot;</i> (b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
break;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
lang=EN-US> }</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
lang=EN-US> </span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>临时整数转换成临时实数格式。</p>

<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
lang=EN-US> void <u><span style='color:blue'>int_to_real</span></u>(const <u><span
style='color:blue'>temp_int</span></u> * a, <u><span style='color:blue'>temp_real</span></u>
* b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
lang=EN-US> {</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>由于原值是整数，所以转换成临时实数时指数除了需要加上偏置量<span
lang=EN-US>16383</span>外，还要加上<span lang=EN-US>63</span>。</p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>表示有效数要乘上<span
lang=EN-US>2</span>的<span lang=EN-US>63</span>次方，即都是整数值。</p>

<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b-&gt;a = a-&gt;a;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b-&gt;b = a-&gt;b;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (b-&gt;a ||
b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = 16383 + 63 + (a-&gt;sign? 0x8000:0);</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; else {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent = 0;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
return;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>

<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>对格式转换后的临时实数进行规格化处理，即让有效数最高有效位不是<span
lang=EN-US>0</span>。</p>

<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; while (b-&gt;b
&gt;= 0) {</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
b-&gt;exponent--;</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
__asm__(<i>&quot;addl %0,%0 ; adcl %1,%1&quot;</i></span></p>

<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;=r&quot;</i> (b-&gt;a),<i>&quot;=r&quot;</i> (b-&gt;b)</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:<i>&quot;&quot;</i> (b-&gt;a),<i>&quot;1&quot;</i> (b-&gt;b));</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
lang=EN-US> }</span></p>

<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
lang=EN-US> </span></p>

<div class=a align=center style='text-align:center'><span lang=EN-US>

<hr size=4 width="100%" align=center>

</span></div>

<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>

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